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研究生: 陳福全
論文名稱: 銀覆蓋層對鈷超薄膜在鉑(111)上的磁性影響
指導教授: 沈青嵩
學位類別: 碩士
Master
系所名稱: 物理學系
Department of Physics
論文出版年: 2001
畢業學年度: 89
語文別: 中文
論文頁數: 80
中文關鍵詞: 歐傑電子低能量電子繞射柯爾效應磁異向性
英文關鍵詞: AES, LEED, SMOKE, SRT, Co, Ag, Pt
論文種類: 學術論文
相關次數: 點閱:177下載:4
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  • 我們以自製的磁光柯爾效應儀 (SMOKE) 探測Ag超薄膜覆蓋於Co/Pt(111)樣品前後之表面磁性變化,並藉由歐傑電子能譜術 (AES) 鑑別樣品表面組成成分、計算薄膜厚度,以及低能量繞射電子儀 (LEED) 研究表面結構,升降溫系統與離子濺射進行退火效應與深度分析的實驗。
    我們發現在1ML及2ML Co/Pt(111)其樣品磁化易軸在垂直樣品表面方向,近1ML的Ag覆蓋會增強矯頑力HC達到最大的幅度。而1ML Ag/1ML Co/Pt (111)經650K退火後,因Co-Pt合金的形成,室溫下polar方向的柯爾訊號增至退火前200%,但經710K退火的樣品則因室溫325K時HC大於外加磁場而量測不到柯爾訊號。至於1ML Ag/2.2ML Co/Pt (111)磁性變化則與1ML Ag/1ML Co/Pt(111)相類似,但因Co厚度增加使得居禮溫度由後者之710K提高至780K,此外室溫325時之HC尚小於外加磁場,故可量測到柯爾訊號。
    3ML Co/Pt(111)則因Co薄膜呈三維島狀成長,使樣品磁化易軸提前轉為平行樣品表面的方向,但經1ML的Ag覆蓋後,產生spin reorientation transition (SRT)的現象,磁化易軸轉為垂直樣品表面的方向;同樣的現象在4ML Co/Pt(111)及5ML Co/Pt(111)中發現,並經由深度分析確定SRT的產生機制來自Ag覆蓋層的影響。同時我們也觀察Ag覆蓋後樣品升降溫過程的磁性變化,並在論文討論之。
    而8ML Co/Pt(111)則在Ag覆蓋厚度達1.5ML層時,才量測到polar方向的柯爾訊號,我們推測Ag覆蓋層達1ML時已增強垂直磁異向性,只是HC大於外加磁場而量測不到訊號,隨著Ag覆蓋層厚度增加HC減小而測得柯爾訊號。此外我們並不確定是Ag-Co介面或者是量子效應干涉造成這樣的現象,值得再深入研究。

    Chapter 1 緒論……………………………………………………………….1 Chapter 2 基本原理 2-1 薄膜成長…………………………………..…………………………….3 2-1-1成長模式…………………………………………………………..4 2-1-2 影響薄膜成長的因素…………………………………………….4 2-2 磁性物質………………………………………………………………5 2-2-1磁性物質…………………………………………………………..5 2-2-2 鐵磁性物質……………………………………………………….7 2-2-3 居禮溫度………………………………………………………….8 2-3 磁異向性…………………………………………………………………8 2-3-1磁異向能…………………………………………………………..9 2-3-2影響磁異向性的因素……………………………………………..9 Chapter 3 實驗原理與儀器 3-1 超高真空系統…………………………………………………………..13 3-1-1 真空理論………………………………………………………...13 3-1-2 超高真空腔與抽氣系統………………………………………...15 3-1-3 樣品清潔與升降溫系統………………………………………...18 3-1-4蒸鍍系統…………………………………………………………20 3-1-5 其他系統………………………………………………………...21 3-2 歐傑電子能譜術………………………………………………………..21 3-2-1 歐傑效應………………………………………………………...21 3-2-2 歐傑電子能譜…………………………………………………...23 3-2-3 阻滯電場分析儀………………………………………………...24 3-2-4 歐傑電子能譜術之應用………………………………………...26 3-3 歐傑訊號計算薄膜厚度………………………………………………..28 3-3-1 歐傑訊號計算薄膜厚度………………………………………...28 3-3-2 平均自由徑的計算……………………………………………...29 3-3-3 back-scattering terms 的計算……………………………………31 3-3-4 cosθ的計算……………………………………………………...31 3-3-5薄膜厚度之計算…………………………………………………32 3-4 低能量電子繞射儀……………………………………………………..36 3-4-1 LEED之基本原理……………………………………………….37 3-4-2 RFA-LEED工作原理……………………………………………38 3-5 磁光柯爾效應…………………………………………………………..39 3-5-1磁光柯爾效應……………………………………………………39 3-5-2 SMOKE及測量原理…………………………………………………….40 3-5-3 表面磁光柯爾效應儀的元件…………………………………………42 Chapter 4 實驗結果與討論 4-1 樣品準備………………………………………………………………..44 4-2 1ML Ag/1ML Co/Pt (111) 的磁性探………………………………...45 4-3 1ML Ag/2.2ML Co/Pt (111) 的磁性探測……………………………54 4-4 1ML Ag/3ML Ag/Pt (111) 的磁性探………………………………...58 4-5 1.5ML Ag/4ML Co/Pt (111) 的磁性探測……………………………61 4-6 1ML Ag/5ML Co/Pt (111) 的磁性探………………………………...66 4-7 2ML Ag/8ML Co/Pt (111) 的磁性探………………………………...72 Chapter 5 結論…………………………………………………………...74 參考資料…………………………………………………………………….76

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